查看apache 已加载模块

bsd# which httpd
/usr/local/sbin/httpd
bsd# httpd --help
(48)Address already in use: make_sock: could not bind to address [::]:80
(48)Address already in use: make_sock: could not bind to address [::]:443
[Tue Nov 09 09:31:22 2010] [warn] (2)No such file or directory: Failed to enable the 'httpready' Accept Filter
[Tue Nov 09 09:31:22 2010] [warn] (2)No such file or directory: Failed to enable the 'dataready' Accept Filter
bsd# httpd  -M  --已成功加载的模块
Loaded Modules:
 core_module (static)
 mpm_prefork_module (static)
 http_module (static)
 so_module (static)
 authn_file_module (shared)
 authn_dbm_module (shared)
 authn_anon_module (shared)
 authn_default_module (shared)
 authn_alias_module (shared)
 authz_host_module (shared)
 authz_groupfile_module (shared)
 authz_user_module (shared)
 authz_dbm_module (shared)
 authz_owner_module (shared)
 authz_default_module (shared)
 auth_basic_module (shared)
 auth_digest_module (shared)
 file_cache_module (shared)
 cache_module (shared)
 disk_cache_module (shared)
 dumpio_module (shared)
 reqtimeout_module (shared)
 include_module (shared)
 filter_module (shared)
 charset_lite_module (shared)
 deflate_module (shared)
 log_config_module (shared)
 logio_module (shared)
 env_module (shared)
 mime_magic_module (shared)
 cern_meta_module (shared)
 expires_module (shared)
 headers_module (shared)
 usertrack_module (shared)
 unique_id_module (shared)
 setenvif_module (shared)
 version_module (shared)
 ssl_module (shared)
 mime_module (shared)
 dav_module (shared)
 status_module (shared)
 autoindex_module (shared)
 asis_module (shared)
 info_module (shared)
 cgi_module (shared)
 dav_fs_module (shared)
 vhost_alias_module (shared)
 negotiation_module (shared)
 dir_module (shared)
 imagemap_module (shared)
 actions_module (shared)
 speling_module (shared)
 userdir_module (shared)
 alias_module (shared)
 rewrite_module (shared)
 php5_module (shared)
Syntax OK
bsd# httpd -l  --已编译模块
Compiled in modules:
  core.c
  prefork.c
  http_core.c
  mod_so.c

详细用法，参见 man httpd